Emission Comparison: Prius / HS250h / Insight / Civic Hybrid / Jetta (Gas+TDI) / WRX STI

[SageBrush]

Originally Posted by usbseawolf2000

Wow, I must have missed it. Do you have a link to the PDF? I can put it in my spreadsheet and get the charts out.

http://www.arb.ca.gov/msprog/onroad/...8_pz_hevge.pdf

[usbseawolf2000]

Here is the comparison of the PHV Prius and the Volt.

Carbon Monoxide:


Exhaust Emission:


Evaporative Emission:

[SageBrush]

Nice! Bars though don't tell the whole story:

[usbseawolf2000]

Originally Posted by SageBrush

Nice! Bars though don't tell the whole story:

That multiplier tells another story. Even if PHV Prius drove with the gas engine for 150,000 miles, the CO and NOx emission would still be the same or less than Volt driven for 7,500 miles in CS mode.

[HTMLSpinnr]

To keep this more Toyota Relevant, is there any difference between the 2010 Prius and the PHV?

[usbseawolf2000]

Originally Posted by HTMLSpinnr

To keep this more Toyota Relevant, is there any difference between the 2010 Prius and the PHV?

PHV Prius' exhaust emission is slightly worse but the evaporative emission is better.

This is very good for a plugin considering the emission of the aftermarket plugin conversions.

Exhaust Emission:


Evaporative Emission:

[bwilson4web]

Originally Posted by usbseawolf2000

PHV Prius' exhaust emission is slightly worse but the evaporative emission is better.

This is very good for a plugin considering the emission of the aftermarket plugin conversions.

Exhaust Emission:


. . .

When I see the same engine go through the same test and different results, I begin to wonder about the reproducibility of the test. Given the very low values, nearly to the scale limits, it is easy to look at the relative values and infer a pattern that may be due to a sampling error. In engineering, we have to be very careful when looking at the limits of instrumentation.

It would help to review their test protocol looking for: (1) sample set, how many different cars are tested; (2) temperature protocol or how the test vehicles are handled during the test, and; (3) calibration protocol for the instrumentation. There are so many ways when dealing at the limits of detection that a review makes sense.

Bob Wilson

[Mike Dimmick]

Originally Posted by bwilson4web

It would help to review their test protocol looking for: (1) sample set, how many different cars are tested; (2) temperature protocol or how the test vehicles are handled during the test, and; (3) calibration protocol for the instrumentation. There are so many ways when dealing at the limits of detection that a review makes sense.

CARB and EPA use the same test protocol, I believe - only the thresholds are slightly different, in that CARB SULEV II CO emissions must be less than Federal Tier 2 Bin 2 (1.0 grams per mile versus 2.1 g/mi). The manufacturer does the test on one example and submits the results. In theory the test results could be audited and the company fined if they are found to be fraudulent, i.e. independent testing results are outside the reasonable distribution that you might expect.

Emission Standards: USA: Cars and Light-Duty Trucks - Tier 2
Emission Standards: USA: Cars and Light-Duty Trucks - California

I suspect that as Toyota know the Prius is going to beat the standards by a very long way, that they just run it for best fuel economy and let the emissions take care of themselves. They're not trying to optimize the test result for least emissions to just squeeze into the lowest category.

[usbseawolf2000]

2011 Sonata Hybrid got SULEV rating. Great job, Hyundai!

See below for the comparison between the midsize hybrids. Prius is still the king.



Source

[usbseawolf2000]

Ok, time for the entire Prius family. Generally, there is an overall improvement in the production version of Prius PHV.

Prius Family Exhaust Emission



Prius Family Evaporative Emission